Warp tension and let-off



J. J. RUHREN WARP TENSION AND-LET-OI'TF April 17, 1928. 6 1,666,835

Filed July 15. 1926 2 Sheets-Sheet 2 Inventor JZ Zn J PuZren Attorney Patented Apr. 17, 1928.

' UNITED STATE;

Joan Janus; mama; or Gamma,

VIPOND Ann WILLIAM" B. LEIrdmiaob'fi" or MONTREAL, cAnAn'A.

WARP TEivs'foN AND LET-Oil.

Application i i-l ed July 1 This invention relates to an improved warp tension and letbif, of theresistance typeto govern theten'sion of the warp and cloth in weaving, in a manner that will automatically maintain a perfectly uniform tension under all normal weaving conditions, from the time the loom starts weaving on the full warp beam until the warp is woven out. o

In the present invention, theamount of tension requiredto properly weave the cloth that maybe put in the loom, can be quickly and accurately weighed out iatth'e start of the ,Weaving, and the tension locked in this position, after which it will hold this ten sion perfectly, regardlessof the size or diameter of the warp yarn on the beam, I and without attention or adjustmentuntil this class; of workor the warp is finished;

This device is wholly mechanical, and simple in its action, and has no attachments such as auxiliaryrolls, or pads to; bear on the warp yarn on thebea n, or devices that are acted on bythe weight of the warp and beam or variablesprings to increase or decrease the tension as the warp weaves t nor y ha ns, S p sp n s or .f c: tion devices of any kind, and ereates a floatin g, balanced tension, from the warp beam to the cloth and take up roll, thru the compound weighted levers, acting in unison with the whip roll rod, and the whip roll and its control of the pawl on the ratchet, and auto matica lly controlling the tensioniat a pre determined limit. y I; v v V H Other features and advantages accompany the invention andthese will become apparent from the following description and drawing.

In the accompanying drawings forming a part of this application, and inwhich like numerals are employed to designate like parts throughout the same Figure 1 is a perspective view of a warp tension and let-off constructed in accordance with the present invention. I V

F ig. 2 is an enlarged fragmentary detail view in section and elevation, showing the gear and worm drives. I; u Fig, 3 is an elevation'of. one of the details.

Referring to the drawingsin detaihthe reference .1 designates an upright, and the reference character Q- desig Iates a comple mental uprightat the opposite side of the machine, bot-h uprightsbeing' substantially the same in construction, and provided at 1926. serial; No. 122,163;

their lower ends with feet whereby they may bee firmly fastened tothe floor. 7

Extending at right angles from the upper ends of the uprights are slotted attzuzhing arms 3 and 4. Also located at this part of the machine is a horizontal whip 'rojlba'rb, above which is the'whip roll 6 Each bar is mounted for rotation in suitable bearings at the upper ends of said uprights. Inter; posed between the ends of the whip roll;

and the upper endsof the uprights, are spec' ial bearing brackets 7 for ,rotatably and swingably mounting said" whip roll. The brackets are' rigidlyfastening to the wrip?v roll bar. The end portions of t he whip roll bar 5 extend; through bearings in the uprights and beyondsaiduprights. v .Reck i arms. 8 a e" f ten i ot e, xe tended ends of theha'r. The ,shortvertical arnr 9, of a rock-ably mounted bell crank lever is connectedby a'pin' and slotconnect on w h 'the1 m ndpf ea h. ke rmh ho iz a m .0 ify -he el cr cooperates with an; upstanding slotted retaining bracket or floor stand 11. p Inthis connection, it might be statedthat the arm 10 mn yc ries est ex end rough he o n, e, r etl and a; umb nu 12 is threaded on this shaft. V Thus, the arm may be adjusted to and held in different 2). Also at this end of the shaft i beveled gear 21 in mesh with a complemental beveled gear 22 on a short stub shaft 23. Further, mountedon thisstub shaft, is aratchet wheelQat. ,In, addition,- thereis' a shaft 25 provided with a small gear 26 in';- m"es h with pinion 21, thus affording-an operating con nection between the shaft 25,- the shaft 17,

and the warpbeamy -Incidentally the hand crank lQ ma'y be attached from: the rearof the machine to the squaredend of the shaft 17 by the loom fixer for initial adjustment of the warp beam. Also, it can be then removed and attached to the shaft 25, for ad justment from'the front by the weaver.

As shown plainly in Fig. 1, an actuating pawl 27 cooperates with the teeth on the ratchet wheel. The pawl is of the reciprocatory type and is connected with and operated from the lay sword (not shown). A lifting link 28 is connected to the pawl and further connected to a small bell crank 29 pivotally mounted on the arm 3, this bell crank being operated by an additional link 30 connected with one of the rockably mounted bearing brackets ,7.

While I make use of the ordinary worm gear attached to the warp beam and driven by a worm and shaft in connection with a pawl and ratchet, I claim-as novel the manner of connection and control and action of the pawl on the ratchet by the swinging balanced whip roll thru its compound swinging connection with the weighted levers and the gradual automatic change in the position of the whip roll towards the fell of the cloth as the warp weaves out, without interfering with any other normal action of the device to automatically increase the forward movement of the warp beam as the diameter of the warp on the beam decreases and thus deliver the warp in the quantity needed, and under control until the warp isfinished, and during the period the normal action of the -whip roll, thru its connections as noted,

maintains a perfectly uniform tension.

While the whip roll has a normal but irregular movement back and forward in unison with its compound lever connections to control and keep the tension uniform, this movement does not materially increase as the warp on the beam weaves out, as the gradual change in the position of the whip roll previously noted, allows this normal vibration of the whip roll to operate the pawl to increase the movement of the ratchet until the warp is finished.

All these movements are flexible and automatic as when a slight excess of warp is delivered by the beam thru the action of the pawl on the ratchet, the balanced whip roll moves back this excess is being delivered, thus holding the tension uniform, and by this same action of the pawl on the ratchet the balanced whip roll moves back as this excess is being delivered, thus holding the tension uniform, and by this same action decreases the amount of warp to be delivered by the succeeding strokes of the pawl on the ratchet. If the action of the pawl on the ratchet fails to deliver enough Warp at any stroke or strokes of-the pawl the whip roll moves forward and makes up the deficiency and by this action increases the amount of warp to be delivered. by the succeeding strokes of the pawl and on these same principles all the normal defects that come up during the weaving operations are forestalled and prevented. 7

It is believed that by considering the description in connection with the drawings,

persons familiar with inventions of this class will be able to obtain a clear understanding of the same, and the manner in which it cooperates withthe customary loom. Therefore, a more lengthy description is thought unnecessary.

Minor changes coming within the field of invention claimed may be resorted to if olesired. v

Having thus described my invention, what I claim as new is 1. In. a warp tension and let-off of the class described, a pair of uprights, arms whereby said uprights may, be connected with the frame of a loom, a warp beam mounted for rotation between said uprights, a whip roll mounted for simultaneous rotation and swinging motion between said uprights above said warp beam, a rocker arm for said whip roll, a bell crank'mounted for pivotal movement and connection with said rocker arm, an adjusting weight carried by said bell crank, astand, a connection between the bell' crank and the stand whereby the bell crank may be held against movement, a second bell crank mounted on one of the aforesaid arms, a link connection between the whip roll and one arm of the bell crank, an actuating pawl cooperable with said ratchet wheel, a link connection between said second bellcrank and pawl, and an operating connection between the ratchet wheel and warp beam.

2. In a warp tension and let-off of the class described, a pair of vertical uprights provided at their upper ends with bearings. horizontal arms carried by the upper ends of said uprights, said arms being adapted for connection with the frame of a loom, a warp beam mounted for rotation between said up rights, a whip roll bar'journaled for rotation in said bearings, bearing brrcketsfastened to said whip roll bar for rocking movement, a whip roll mounted for rotation upon said brackets, adjustable balancing means: for said whip roll bar and whip roll, a driving gear carried by said warp beam, a ratchet wheel, an operating connection. between the ratchet wheel and said gear, a reciprocatory actuating pawl cooperable with the ratchet wheel, a bell crank pivotally mounted on one of the aforesaid arms, a link connection between one of said brackets and said bell crank, and a lifting link connection between said bellcrank and said pawl.

33. In a warp tension and let-off, of the class described, a pair of spaced uprights provided at their upper ends with bearings, a whip roll bar journaled for rotation in said bearings, a whiproll carried by said emmas bar, a warp beam mounted for rotation upon said intermediateportion of said uprights, a driving gear carried by said beam, a ratchet wheel, an operating connection betweenthe ratchet wheel and said gear, areciprocatory actuating pawl cooperable with said teeth of said ratchet wheel; regulating means for said pawl connected with the pawl and said whip roll bar, and balancing means Tor said bar comprising a rocker arm fastened to one JOHN JULIUS RUHREN. 

